Pharmaceutical composition comprising dapagliflozin

ABSTRACT

The present invention relates to solid oral pharmaceutical compositions comprising amorphous dapagliflozin. The invention further relates to a process for the preparation of the said pharmaceutical compositions. The said compositions are administered orally for the treatment of diabetes mellitus. The said compositions provide the desired immediate release of dapagliflozin and were found to be stable under accelerated conditions.

This application is the U.S. national stage of International Patent Application No. PCT/IB2018/051221, filed Feb. 27, 2018, which claims the benefit of Indian Patent Application No. 201721009146, filed Mar. 16, 2017.

FIELD OF THE INVENTION

The present invention relates to solid oral pharmaceutical compositions comprising amorphous dapagliflozin. The invention further relates to a process for the preparation of the said pharmaceutical compositions.

BACKGROUND OF THE INVENTION

Dapagliflozin is a sodium-glucose cotransporter 2 inhibitor (SGLT2) indicated in the treatment of diabetes mellitus, in particular type 2 diabetes. It prevents reabsorption of at least 90% of the glucose in the kidney and facilitates elimination of the glucose through the urine. In the United States of America, it is available as immediate release tablets in the dose strengths of 5 mg and 10 mg under the brand name FARXIGA®. The active ingredient in FARXIGA® is a crystalline form of dapagliflozin propylene glycol hydrate.

U.S. Pat. No. 6,515,117 discloses SGLT2 inhibitor compound dapagliflozin and provides a method for treating diabetes and related disease.

U.S. Pat. No. 7,919,598 and WO2008/002824 disclose the crystalline solvates and complexes of (IS)-1, 5-anhydro-L-C-[3-((phenyl)methyl) phenyl)-D-glucitol derivatives with amino acids. In particular, the crystalline polymorphs of dapagliflozin propylene glycol hydrate is disclosed.

U.S. Pat. Nos. 8,221,786, 7,851,502, 8,716,251 and 8,361,972 disclose immediate release pharmaceutical formulation comprising dapagliflozin propylene glycol hydrate and a pharmaceutical acceptable carrier.

U.S. publication no. 2013/0237487 discloses an amorphous form of dapagliflozin.

PCT publication no. WO2015/104658 discloses amorphous form of dapagliflozin, amorphous solid dispersion of dapagliflozin together with one or more pharmaceutically acceptable carriers, process for its preparation and pharmaceutical composition thereof. The said carriers are selected from polyvinylpyrrolidones, hydroxypropylmethylcellulose, hydroxypropylcellulose, or hydroxypropylmethylcellulose acetate succinate.

U.S. publication no. 2016/0256433 discloses an amorphous solid dispersion comprising dapagliflozin and at least one polymer, a pharmaceutical composition comprising said amorphous solid dispersion and the process for its preparation. These compositions of dapagliflozin under stress and accelerated storage conditions were found to be stable for a period of 3 months.

PCT publication no. WO2015/128853 discloses pharmaceutical compositions comprising solid dispersion of dapagliflozin and one or more pharmaceutically acceptable excipients and the process for their preparation.

There is a need to provide an immediate release pharmaceutical composition comprising amorphous dapagliflozin which is

-   -   stable under accelerated storage conditions of 40° C. and 75%         relative humidity (RH), for a period of at least 6 months as per         the recommendation of the ICH guidelines; and/or     -   bioequivalent to FARXIGA®

OBJECTS OF THE INVENTION

The object of present invention is to provide a stable pharmaceutical composition of amorphous dapagliflozin.

Another object of the present invention is to provide the said composition in the form of an immediate release dosage form.

It is yet another object of the present invention to provide the said composition which is bioequivalent to FARXIGA®

It is yet another object of the present invention to provide the said composition in the form of powders, granules, pellets, mini-tablets, tablets, or capsules.

It is yet another object of the present invention to provide a process for the preparation of the said compositions comprising amorphous dapagliflozin.

DETAILED DESCRIPTION OF THE INVENTION

The present invention provides pharmaceutical compositions comprising amorphous dapagliflozin and at least one surfactant.

It has surprisingly been found that the said compositions comprising amorphous dapagliflozin and at least one surfactant are stable under accelerated storage conditions of 40° C. and 75% relative humidity, for a period of at least 6 months as per the recommendation of the ICH guidelines.

It has surprisingly been found that the said compositions comprising amorphous dapagliflozin and at least one surfactant are bioequivalent to FARXIGA®.

The said compositions of the present invention provide immediate release of dapagliflozin.

The said compositions of the present invention are administered orally for the treatment of diabetes mellitus.

The compositions of the present invention further comprise at least one excipient selected from diluent, binder, disintegrating agent, antioxidant, lubricant, glidant, pigments, colouring agent, and mixtures thereof.

Dapagliflozin in accordance with the present invention is characterized by particle size distribution (PSD) as determined by the laser diffraction method (e.g. in Malvern Master Sizer). The term particle size distribution (PSD) as used herein means cumulative volume size distribution of equivalent spherical diameter.

The particle size distribution of dapagliflozin used in the preparation of the pharmaceutical composition of the present invention has d (0.9) value <250 μm, preferably in the range of 1 μm to 225 μm, more preferably in the range of 25 μm to 200 μm, and most preferably in the range of 50 μm to 175 μm.

The particle size distribution of dapagliflozin used in the preparation of the pharmaceutical composition of the present invention has d (0.5) value <100 μm, preferably in the range of 0.5 μm to 90 μm, more preferably in the range of 5 μm to 80 μm, and most preferably in the range of 10 μm to 70 μm.

The particle size distribution of dapagliflozin used in the preparation of the pharmaceutical composition of the present invention has d (0.1) value <25 μm, preferably in the range of 0.1 μm to 20 μm, more preferably in the range of 0.5 μm to 15 μm, and most preferably in the range of 1 μm to 10 μm.

In one of the embodiments the particle size distribution of the dapagliflozin used in the preparation of the pharmaceutical composition may have

d (0.1) value in the range from 2 μm to 12 μm,

d (0.5) value in the range from 20 μm to 75 μm, and

d (0.9) value in the range from 75 μm to 200 μm.

Dapagliflozin is present in an amount from 0.1% to 25% by weight of the composition, preferably from 0.5% to 15%, more preferably from 1% to 7.5%, and most preferably from 2.5% to 5% by weight of the composition.

Surfactant is selected from polysorbates (for example polysorbate 20, polysorbate 40, polysorbate 60, polysorbate 65, polysorbate 80, polysorbate 85, micro-encapsulated polysorbate 80 such as SEPITRAP™ 80, micro-encapsulated polyoxyl 40 hydrogenated castor oil such as SEPITRAP™ 4000), polyoxyethylene castor oil derivatives polyoxyethylene hydrogenated castor oil (for example CREMOPHOR®), ethoxylated hydrogenated castor oil, phosphatidyl choline, phospholipids, medium chain triglycerides, docusate sodium, lecithin, glyceryl monostearate, sorbitan monostearate (SPAN® 60), sorbitan monopalmitate (SPAN® 40), sorbitan monolaurate (SPAN® 20), poloxamers (polyoxyethylene polyoxypropylene block copolymers), sodium lauryl sulfate, polyoxyethylene alkyl ethers, polyoxyethylene stearates, sorbitan fatty acid esters, sucrose esters of fatty acids, PEG-8 Caprylic-Capric glycerides (DUBCARE GPE 810), saturated polyglycolized glycerides, tocopherol PEG succinate, and mixtures thereof.

The surfactant is present in an amount from 0.1% to 25% by weight of the composition, preferably from 0.5% to 20%, more preferably from 1% to 15%, and most preferably from 2.5% to 10% by weight of the composition.

The ratio of dapagliflozin to the surfactant is usually in the range of about 1:0.1 to 1:10.

In one of the embodiments of the invention, the ratio of dapagliflozin to surfactant is in range of about 1:0.2 to 1:5, preferably in the range of about 1:0.25 to 1:3, more preferably in the range of about 1:0.3 to 1:1.5 and most preferably in the range of about 1:0.4 to 1:1.3.

Diluent is selected from anhydrous lactose, lactose monohydrate, cellulose derivatives (e.g. cellulose, microcrystalline cellulose, silicified microcrystalline cellulose) sugar, mannitol, glucose, sucrose, dextrose, fructose, compressible sugar, starches, modified starches, inorganic salts, calcium sulfate, calcium silicate, calcium phosphate, dibasic calcium phosphate, tribasic calcium phosphate, magnesium aluminometasilicate, sorbitol, xylitol, lactitol, dextran, maltodextrin, cetyl alcohol, stearyl alcohol, waxes, and mixtures thereof.

The diluent is present in an amount from 5% to 90% by weight of the composition, preferably from 10% to 85% and more preferably from 15% to 80% by weight of the composition.

Binder is selected from povidone, hydroxypropyl methylcellulose (HPMC), hydroxypropyl cellulose (HPC), hydroxyethyl cellulose (HEC), methylcellulose (MC), carboxymethylcellulose (CMC), sodium carboxymethylcellulose, calcium carboxymethylcellulose, starch paste, ethylcellulose, polymethacrylates, gelatin, polyethylene oxide, gums (example xanthan gum, guar gum, acacia, locust bean gum or alginates), polyvinyl alcohol, and mixtures thereof.

The binder is present in an amount from 0.1% to 35% by weight of the composition, preferably from 0.5% to 20%, more preferably from 1% to 10%, and most preferably from 2.5% to 7.5% by weight of the composition.

Disintegrating agent is selected from sodium starch glycolate, crospovidone, croscarmellose sodium, croscarmellose calcium, croscarmellose potassium, starch, starch 1500, modified starch, pregelatinized starch, crosslinked carboxymethyl starch, sodium hydrogen carbonate, sodium carbonate, low substituted hydroxypropyl cellulose, and mixtures thereof.

The disintegrating agent is present in an amount from 0.1% to 25% by weight of the composition, preferably from 0.5% to 15%, more preferably from 1% to 10%, and most preferably from 2.5% to 7.5% by weight of the composition.

Antioxidant is selected from butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), sodium ascorbate, potassium sorbate, sorbic acid, sodium sulfite, tocopherol, Vitamin E derivatives, citric acid, malic acid, ascorbic acid, and mixtures thereof. The antioxidants may be present in an amount from 0.05% to 5% by weight of the composition.

Lubricant is selected from magnesium stearate, calcium stearate, stearic acid, sodium stearyl fumarate, sodium benzoate, palmitic acid, glyceryl monostearate, glyceryl behenate, and mixtures thereof. The lubricant may be present in an amount from 0.25% to 5% by weight of the composition.

Glidant is selected from suitable glidants known in the art. Examples of suitable pharmaceutically acceptable glidant are talc and colloidal silicon dioxide. The glidants may be present in an amount from 0.1% to 10% by weight of the composition.

Pigment is selected from titanium dioxide, iron oxide (e.g. iron oxide yellow, iron oxide red, iron oxide brown, iron oxide black or mixtures thereof) or mixtures thereof.

Any suitable pharmaceutically acceptable natural, semi-synthetic, or synthetic colors, and flavors may be used. Preferred colors, and flavors are those listed in the handbook of excipients.

The compositions of the present invention may be provided in the form of powders, granules, pellets, mini-tablets, tablets, or capsules.

The compositions in the form of granules, pellets, mini-tablets or tablets may optionally be coated with a film coating layer comprising film coating materials, and optionally plasticizers, colorants, pigments, lubricants, diluents and surfactants.

The film coating material is selected from hydroxypropylmethyl cellulose, hydroxypropyl cellulose, ethylcellulose, polymethacrylates, polyvinyl alcohol, Opadry®, Opadry® AMB, povidone, polyvinyl acetate, gums, waxes, and mixtures thereof. The film coating material is in the range of 0.1% to 20% by weight of the composition.

Plasticizers are selected from propylene glycol, polyethylene glycol, triacetin, triethylcitrate, acetyl triethylcitrate, acetyltributylcitrate, diethyl phthalate, dibutyl phthalate, dibutylsebacate, miglyol, hydrogenated oils, or mixtures thereof.

The plasticizer in the coating layer is present in an amount from 2.5% to 30% by weight of the coating layer, preferably from 5% to 20% by weight, more preferably from 7.5% to 15% by weight, and most preferably from 9% to 11% by weight of the coating layer.

Coating layer may be deposited on the composition using a solvent selected from water, methanol, ethanol, isopropanol, acetone, dichloromethane, ethylacetate or mixtures thereof.

The composition provides immediate release of dapagliflozin when analysed in-vitro using USP II paddle apparatus, at 60 rpm, using 1000 ml of acetate buffer having pH 4.5.

In one of the embodiments, the immediate release composition releases at least about 70% of dapagliflozin within 30 minutes.

In another embodiment, the immediate release composition releases at least about 70% of dapagliflozin within 15 minutes.

In yet another embodiment, the immediate release composition releases at least about 80% of dapagliflozin within 30 minutes.

In yet another embodiment, the immediate release composition releases at least about 80% of dapagliflozin within 15 minutes.

In yet another embodiment, the immediate release composition releases at least about 85% of dapagliflozin within 30 minutes.

In yet another embodiment, the immediate release composition releases at least about 85% of dapagliflozin within 15 minutes.

In yet another embodiment, the immediate release composition releases at least about 90% of dapagliflozin within 30 minutes.

In yet another embodiment, the immediate release composition releases at least about 90% of dapagliflozin preferably within 15 minutes.

In yet another embodiment, the immediate release composition releases at least about 90% of dapagliflozin more preferably within 10 minutes.

In yet another embodiment, the immediate release composition releases at least about 90% of dapagliflozin most preferably within 5 minutes.

In one of the embodiments, the present invention provides a method for treating type II diabetes comprising administering to a mammal in need of such treatment a pharmaceutical composition comprising therapeutically effective amount of dapagliflozin.

The composition of the present invention comprising dapagliflozin, further comprises at least one additional active ingredient.

In another embodiment, the present invention provides a method for treating type II diabetes comprising administering to a mammal in need of such treatment a pharmaceutical composition comprising therapeutically effective amount of dapagliflozin in combination with additional active ingredient(s).

The additional active ingredient may be selected from an anti-diabetic agent, an anti-hyperlipidemic agent, an anti-hypertensive agent, an anti-obesity agent, or mixtures thereof.

Examples of suitable active ingredients that can be used in combination with the dapagliflozin compositions of the present invention include: biguanides (e.g. metformin, phenformin), insulin, sulfonylureas (e.g. glyburide, glimepiride, glipizide, gliclazide, chlorpropamide), thiazolidinediones (e.g. pioglitazone, rosiglitazone, troglitazone), alpha-glucosidase inhibitors (e.g. acarabose, voglibose, miglitolol), DPP4 inhibitors (e.g. sitagliptin, vildagliptin, saxagliptin, linagliptin, alogliptin), PPAR agonist (for e.g. saraglitazar, muraglitazar, peliglitazar, tesaglitazar), meglitinides (e.g. repaglinide, nateglinide), and or other SGLT2 inhibitors (e.g. canagliflozin, ertugliflozin).

In one aspect, dapagliflozin in the compositions of the present invention is not in the form of a solid dispersion.

In another aspect, dapagliflozin in the compositions of the present invention is not in the form of a co-crystals.

The invention further relates to a process for the preparation of the said pharmaceutical compositions.

The pharmaceutical composition of the present invention may be prepared by various methods such as wet granulation, dry granulation, or direct compression.

In one aspect, the composition of the present invention is not prepared using solid dispersion technique.

In another aspect, the composition of the present invention is not prepared using co-crystals technique.

In one of the embodiments, the process for preparing the said compositions comprise steps of:

-   a. sifting amorphous dapagliflozin, at least one surfactant, and one     or more pharmaceutically acceptable excipients selected from     diluents, binders, disintegrating agents, antioxidants, lubricants,     and glidants; -   b. mixing the sifted material of step “a” to obtain a drug mixture; -   c. filling the drug mixture of step “b” into capsules or compressing     the drug mixture of step “b” into tablets; -   d. optionally, film coating the tablets of step “c” to obtain film     coated tablets.

In another embodiment of the invention, the process for preparing the said compositions comprise steps of:

-   a. sifting amorphous dapagliflozin, at least one surfactant, and one     or more pharmaceutically acceptable excipients selected from     diluents, binders, disintegrating agents, antioxidants, lubricants,     and glidants; -   b. mixing the sifted material of step “a” to obtain a drug mixture; -   c. dry granulating the drug mixture of step “b” by slugging, roll     compacting or any other suitable means, and further processing to     give granules; -   d. optionally mixing the granules of step “c” with one or more     pharmaceutically acceptable excipients selected from diluents,     binders, disintegrating agents, antioxidants, lubricants, and     glidants; -   e. filling the mixture of step “d” into capsules or compressing the     mixture of step “d” into tablets; -   f. optionally, film coating the tablets of step “e” to obtain film     coated tablets.

In another embodiment of the invention, the process for preparing the said compositions comprise steps of:

-   a. sifting and mixing one or more pharmaceutically acceptable     excipients selected from surfactants, diluents, binders,     disintegrating agents, and antioxidants; -   b. dispersing and/or dissolving amorphous dapagliflozin in a solvent     selected from water, methanol, ethanol, isopropanol, acetone,     dichloromethane, ethyl acetate or mixtures thereof; -   c. optionally adding surfactant to the dispersion or solution of     step “b”; -   d. granulating the mixture of step “a”, with the dispersion or     solution of step “c”, to obtain a wet mass; -   e. drying the wet mass of step “d” in a suitable dryer to obtain     dried granules; -   f. milling the dried granules of step “e” using a suitable mill; -   g. mixing the dried granules of step “f” with one or more     pharmaceutically acceptable excipients selected from diluents,     binders, disintegrating agents, antioxidants, lubricants, and     glidants; -   h. filling the mixture of step “g” into capsules or compressing the     mixture of step “g” into tablets; -   i. optionally film coating the tablets of step “h” to obtain film     coated tablets.

The invention is now illustrated with non-limiting examples.

Example I

TABLE 1 Composition of dapagliflozin tablets No. Ingredients % w/w 1 Amorphous Dapagliflozin 3.92 [d(0.1) = 7.27 μm; d(0.5) = 58.7 μm; d(0.9) = 168 μm] 2 Microcrystalline cellulose PH-101 54.91 3 SEPITRAP ™ 80 4.90 4 Anhydrous lactose 19.61 5 Low-substituted hydroxypropyl cellulose LH11 5.88 6 Microcrystalline cellulose PH-112 6.47 7 Colloidal silicon dioxide 1.37 8 Magnesium stearate 0.98 9 Opadry II yellow 1.96

The composition of example I can be prepared by any of the manufacturing techniques as disclosed below:

Manufacturing Process (Ia):

-   1. Amorphous dapagliflozin, microcrystalline cellulose PH 101,     SEPITRAP™ 80, anhydrous lactose, low-substituted hydroxypropyl     cellulose LH11 (3.92% w/w), were sifted through 40 mesh ASTM. -   2. The resulting sifted ingredients of step 1) were blended for     about 15 minutes to obtain a drug mixture. -   3. Microcrystalline cellulose PH-112, low-substituted hydroxypropyl     cellulose LH11 (1.96% w/w), colloidal silicon dioxide and magnesium     stearate were sifted through 40 mesh ASTM and mixed with the drug     mixture of step 2) for about 10 minutes. -   4. The resulting mixture of step 3) was compressed into tablets. -   5. The resulting tablets were film coated with Opadry II yellow.     Manufacturing Process (Ib): -   1. Microcrystalline cellulose PH101, anhydrous lactose, SEPITRAP™     80, low-substituted hydroxypropyl cellulose LH11 (3.92% w/w) were     sifted through 40 mesh ASTM and mixed in rapid mixer granulator     (RMG) for about 10 minutes. -   2. Amorphous dapagliflozin was dissolved in acetone and was added to     the above mixture of step 1) to obtain a wet mass. -   3. Wet mass was dried to obtain dried granules and were sifted     through 30 mesh ASTM. -   4. Microcrystalline cellulose PH112, low-substituted hydroxypropyl     cellulose LH11 (1.96% w/w) and colloidal silicon dioxide were sifted     through 30 mesh ASTM and blended with dried granules of step 3) for     about 10 minutes. -   5. Magnesium stearate was sifted through 40 mesh ASTM and mixed with     the resulting mixture of step 4) for about 5 minutes. -   6. The resulting mixture of step 5) was compressed into tablets. -   7. The resulting tablets were film coated with Opadry II yellow.     Manufacturing Process (Ic): -   1. Microcrystalline cellulose PH101, anhydrous lactose,     low-substituted hydroxypropyl cellulose LH11 (3.92% w/w) were sifted     through 40 mesh ASTM and mixed in RMG for about 10 minutes. -   2. Amorphous dapagliflozin was dissolved in a mixture of isopropanol     and dichloromethane (1:1) and was added to the above mixture of     step 1) to obtain a wet mass. -   3. Wet mass was dried to obtain dried granules and were sifted     through 30 mesh ASTM. -   4. Microcrystalline cellulose PH-112, low-substituted hydroxypropyl     cellulose LH11 (1.96% w/w) and colloidal silicon dioxide were sifted     through 30 mesh ASTM and blended with dried granules of step 3) for     about 10 minutes. -   5. Magnesium stearate was sifted through 40 mesh ASTM and mixed with     the resulting mixture of step 4) for about 5 minutes. -   6. The resulting mixture of step 5) was compressed into tablets. -   7. The resulting tablets were film coated with Opadry II yellow.

Example II

TABLE 2 Composition of dapagliflozin tablets No. Ingredients % w/w 1 Amorphous Dapagliflozin 3.92 [d(0.1) = 3.6 μm; d(0.5) = 13 μm; d(0.9) = 27 μm] 2 SEPITRAP ™ 80 4.90 3 Anhydrous lactose 19.61 4 Crospovidone 3.92 5 Microcrystalline cellulose PH-112 63.34 6 Colloidal silicon dioxide 1.37 7 Magnesium stearate 0.98 8 Opadry II yellow 1.96 Manufacturing Process (II):

-   1. Amorphous dapagliflozin, SEPITRAP™ 80, anhydrous lactose,     crospovidone, microcrystalline cellulose PH-112, and colloidal     silicon dioxide were sifted through 40 mesh ASTM. -   2. The sifted ingredients of step 1) were mixed in a blender for     about 15 minutes. -   3. Magnesium stearate was sifted through 40 mesh ASTM and mixed with     the resulting mixture of step 2) for about 5 minutes. -   4. The resulting mixture of step 3) was compressed into tablets. -   5. The resulting tablets were film coated with Opadry II yellow.

Example III

TABLE 3 Composition of dapagliflozin tablets No. Ingredients % w/w 1 Amorphous Dapagliflozin 3.92 [d(0.1) = 5.36 μm; d(0.5) = 48.8 μm; d(0.9) = 135.04 μm] 2 Anhydrous lactose 19.61 3 Dubcare GPE810 3.92 4 Povidone K 30 3.92 5 Microcrystalline cellulose PH-112 58.44 6 Low-Substituted Hydroxypropyl Cellulose LH11 5.88 7 Colloidal silicon dioxide 1.37 8 Magnesium stearate 0.98 9 Opadry II yellow 1.96 Manufacturing Process (III):

-   1. Microcrystalline cellulose PH-112 (about 46.75% w/w), anhydrous     lactose, povidone K 30 and low-substituted hydroxypropyl cellulose     LH11 (about 3.92% w/w) were sifted through 40 mesh ASTM and mixed in     RMG for about 10 minutes. -   2. Amorphous dapagliflozin was dissolved in acetone followed by     addition of Dubcare GPE 810. -   3. The resulting mixture of step 2) was added to the powder mixture     of step 1) in RMG to obtain a wet mass. -   4. Wet mass was dried to obtain dried granules and were sifted     through 30 mesh ASTM. -   5. Microcrystalline cellulose PH-112 (about 11.69% w/w),     low-substituted hydroxypropyl cellulose LH11 (about 1.96% w/w) and     colloidal silicon dioxide were sifted through 30 mesh ASTM and     blended with dried granules of step 4) for about 10 minutes. -   6. Magnesium stearate was sifted through 40 mesh ASTM and mixed with     the resulting mixture of step 5) for about 5 minutes. -   7. The resulting mixture of step 6) was compressed into tablets. -   8. The resulting tablets were film coated with Opadry II yellow.     Dissolution Profile:

The tablets prepared as per examples I to III were analysed in-vitro using USP II paddle apparatus, at 60 rpm, using 1000 ml of acetate buffer pH 4.5. The results of the dissolution testing are provided in table 4.

TABLE 4 Dissolution profile of tablets of examples I to III % Cumulative Dissolution Profile Time Example Example Example Example Example (mins.) Ia Ib Ic II III 5 54 68 93 33 66 10 78 95 100 48 92 15 85 96 100 57 98 20 89 96 100 62 97 30 90 96 101 72 97

It is evident from table 4 that the dapagliflozin compositions of the present invention provided the desired immediate release dissolution in 5 minutes to 30 minutes.

Stability Studies:

Tablet composition in accordance with example I, containing 10 mg of dapagliflozin, were packed in

i) HDPE container with 2 g silica gel and

ii) Alu-Alu blister.

These packs were subjected to accelerated storage conditions of 40° C./75% RH for a period of six months. The tablets were analysed for in-vitro dissolution, related substances and assay. The results of the accelerated stability testing at the end of six months are disclosed in table 5.

TABLE 5 Stability Study Data Related Substances

  In-vitro dissolution (15 mins)   Dapagliflozin Hydroxy Impurity   Individual Unspecified Impurity     Total Impurities       Assay

  NLT 80%   NMT 0.5%   NMT 0.2%   NMT 1.0%  90.0-  110.0% Pack Initial 98% Not detected BQL Nil 100.30% HDPE 6M 93% 0.29% 0.06% 0.35% 98.10% Bottle 40° C./ 75% RH Alu-Alu 6M 95% 0.36% 0.08% 0.50% 97.50% Blister 40° C./ 75% RH BQL: Below quantification limit NMT: Not more than NLT: Not less than

The stability data in table 5 reveals that there is no significant change in the in-vitro dissolution, related substances and assay value, of the dapagliflozin tablets, in both the packs, on storage. The said tablets were found to be stable for a period of at least 6 months at accelerated storage conditions (40° C./75% RH) as per the recommendation of the ICH guidelines.

Bioequivalence Study:

A randomized, open label, balanced, two treatment, two period, two sequence, single dose, crossover bioequivalence study of dapagliflozin tablets 10 mg of example I was carried out in normal healthy human subjects using Farxiga® (Dapagliflozin) tablets 10 mg of AstraZeneca Pharmaceuticals LP as the reference product.

The bioequivalence studies were carried out under fasting (n=48) and fed conditions (n=48). The % ratio of the geometric mean and the 90% CI for log transformed data are presented in table 6.

TABLE 6 Bioequivalence Data Fasting Condition Fed Condition % Ratio % Ratio Test/ 90% CI for log Test/ 90% CI for log Param- Refer- transformed data Refer- transformed data eters ence Lower Upper ence Lower Upper C_(max) 98.6772 91.1410 106.8366 95.8633 88.6893 103.6176 AUC₀₋₇₂ 99.7096 96.2435 103.3005 99.7835 96.7729 102.8878 AUC_(0-∞) 98.1155 94.5895 101.7729 99.4335 96.4915 102.4652

Based on the results of the bioequivalence studies, the dapagliflozin tablets were found to be bioequivalent to commercially available FARXIGA® tablets.

Thus, the compositions of the present invention provides the desired immediate release of dapagliflozin and was found to be bioequivalent to FARXIGA® tablets. The composition was found to be stable under accelerated conditions (40° C./75% RH) for a period of at least 6 months. 

We claim:
 1. A pharmaceutical tablet composition comprising: a) amorphous dapagliflozin having a d(0.5) in the range from 20 μm to 75 μm, and b) one or more surfactants, wherein (i) the weight ratio of dapagliflozin to the surfactant is from about 1:0.1 to 1:10, and (ii) the tablet is an immediate release tablet.
 2. The composition as claimed in claim 1, wherein the one or more surfactant is selected from the group consisting of micro-encapsulated polysorbate 80, polysorbate 80, polysorbate 85, polysorbate 65, polysorbate 60, polysorbate 40, polysorbate 20, polyoxyethylene castor oil derivatives polyoxyethylene hydrogenated castor oil, ethoxylated hydrogenated castor oil, phosphatidyl choline, phospholipids, medium chain triglycerides, docusate sodium, lecithin, glyceryl monostearate, sorbitan monostearate, sorbitan monopalmitate, sorbitan monolaurate, poloxamers, sodium lauryl sulfate, polyoxyethylene alkyl ethers, polyoxyethylene stearates, sorbitan fatty acid esters, sucrose esters of fatty acids, PEG-8 Caprylic-Capric glycerides, saturated polyglycolized glycerides, and tocopherol PEG succinate.
 3. The composition as claimed in claim 1, wherein the one or more surfactant is from about 0.1% to about 25% by weight of the composition.
 4. The composition as claimed in claim 1, wherein dapagliflozin is from about 0.1% to about 25% by weight of the composition.
 5. The composition as claimed in claim 1, wherein the composition further comprises at least one excipient selected from the group consisting of diluent, binder, disintegrating agent, lubricant, and glidant.
 6. The composition as claimed in claim 5, wherein the disintegrating agent is selected from the group consisting of sodium starch glycolate, crospovidone, croscarmellose sodium, croscarmellose calcium, croscarmellose potassium, sodium carbonate, starch, starch 1500, modified starch, pregelatinized starch, crosslinked carboxymethyl starch, sodium hydrogen carbonate, hydroxypropyl cellulose, and mixtures thereof.
 7. The composition as claimed in claim 1, wherein the composition releases at least about 70% of dapagliflozin within 30 minutes.
 8. The composition as claimed in claim 1, wherein the composition is stable at 40° C. and 75% relative humidity for a period of at least six months.
 9. The composition as claimed in claim 1, wherein the composition is prepared by wet granulation, dry granulation, or direct compression.
 10. The composition as claimed in claim 1, wherein the composition is bioequivalent to an immediate release tablet of a crystalline form of dapagliflozin propylene glycol hydrate.
 11. An immediate release tablet comprising: a) amorphous dapagliflozin having a d(0.5) of 20 μm to 75 μm, and b) a surfactant which is micro-encapsulated polysorbate 80, wherein (i) the weight ratio of dapagliflozin to the surfactant is from about 1:0.1 to 1:10, and (ii) the tablet, after storage at 40° C. and 75% relative humidity in a HDPE container or in an Alu-Alu blister for 6 months, contains no more than 1.0% of total dapagliflozin impurities.
 12. The tablet of claim 11, wherein (i) the tablet comprises 5 or 10 mg of dapagliflozin and (ii) the tablet, after storage at 40° C. and 75% relative humidity in a HDPE container or in an Alu-Alu blister for 6 months, contains more than 90% of the 5 or 10 mg dapagliflozin. 